Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
1
Is any of this happening now?
Call 911
Seek emergency care for:
New severe or rapidly worsening abdominal pain
A hard, very tender, or swollen abdomen
Abdominal pain with fainting, confusion, or marked weakness
Vomiting blood, passing a large amount of blood, or black tar-like stool
Persistent vomiting with an inability to keep fluids down
Chest pain, sudden breathlessness, or coughing up blood
Other emergency signs, for anyone
Someone who is struggling to breathe, gasping, choking, or cannot get words out
Someone who has chest pain, tightness or pressure lasting more than a few minutes
Someone who has sudden weakness or drooping on one side of the face or body, slurred speech, or sudden confusion
Someone who is unconscious, or cannot be woken
Someone who is bleeding heavily and it will not stop with firm pressure
Someone who has had a seizure that will not stop, or does not wake up afterwards
Someone who has lips or skin that look pale, blue, grey or blotchy
Someone who you believe has taken an overdose or swallowed something poisonous
2
Is any of this happening?
Be seen today
If you already have mesenteric venous thrombosis, urgent reassessment is also needed when pain returns or becomes stronger during treatment.
This can indicate worsening blockage, bowel injury, or another abdominal problem.
Contact your usual healthcare service promptly for smaller amounts of unusual bleeding, frequent bruising, ongoing diarrhea, reduced appetite, or medicine side effects.
3
Does any of this apply?
Book an appointment
Questions about treatment length, test results, and stable long-term symptoms can usually be handled during routine follow-up.
Every sign above is quoted from the sofidex article on Mesenteric venous thrombosis. If you are not sure, err upward — it is always reasonable to be checked.